Cancer affects us all. Around 1 in 3 people in the UK will develop cancer during their lifetime. Almost everybody will know someone (or know someone who knows someone) who has been affected by cancer at some stage in their life.It is likely that pupils in your class may already have been affected directly or indirectly by the disease, or may be cancer patients in the future.The aim of this lesson is to dispel some of the myths surrounding the causes of cancer. Using case studies and web-based investigation, students will become familiar with the biology of cancer and its causes, and how these are linked to lifestyle.This lesson plan has strong links with the GCSE Science and Citizenship curricula.